66974509164 has 12 divisors (see below), whose sum is σ = 156273854744. Its totient is φ = 22324836384.

The previous prime is 66974509141. The next prime is 66974509181. The reversal of 66974509164 is 46190547966.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2790604537 + ... + 2790604560.

Almost surely, 2^66974509164 is an apocalyptic number.

It is an amenable number.

66974509164 is an abundant number, since it is smaller than the sum of its proper divisors (89299345580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66974509164 is a wasteful number, since it uses less digits than its factorization.

66974509164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5581209104 (or 5581209102 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 57.

The spelling of 66974509164 in words is "sixty-six billion, nine hundred seventy-four million, five hundred nine thousand, one hundred sixty-four".